Gas burner



FIG. 1 is a top perspective view of a gas burner showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view, the rear being a mirror image thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view, the left side being a mirror image thereof. 

The ornamental design for a gas burner, as shown and described. 